Question

An object of height 5cm is placed in front of a convex lens at a distance of 20cm from it. If the focal length of the lens is 10cm, then the height of the image
is

Answer 1

Answer:

Given, u=-20cm

f=10cm

v=?

We know

f

1

=

v

1

−

u

1

10

1

=

v

1

−

20

(−1)

v

1

=

20

2−1

v=20cm

We know

magnification (M)=

h

o

h

i

=

u

−v

or,

−20

20

=−1=

h

o

h

i

since,h

0

=5cm

so,h

i

=−5cm

nature = real image